Storing Magnets

Magnets become weaker with time (due to ‘free’ poles) near the ends repelling each other and upsetting alignment of tiny magnets).

To prevent this bar magnets are stored in pairs with unlike poles opposite and pieces of soft iron - keepers across the ends.

The keepers become induced magnets and their poles neutralise the poles of the bar magnets.

Contents

History of magnetism, What is a magnet
What do magnets do, Test for a magnet
Magnetic fields
The Earth's magnetic field
Theory of magnetism
Induced magnetism
Magnetic properties of iron and steel
Making a magnet
Electro-magnets
Primary science applications
Fleming's Left Hand Rule
Self assessment
Comments, reflections and study action plan